Drilling-machine



(No Model.)

J. ROSS.

DRILLING MACHINE.

No. 441,900. Patented Dec. 2, 1890.

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UNITED STATES PATENT OFFIOE.

JOSIAH ROSS, OF BUFFALO, NEYV YORK.

DRILLING-MACHI NE.

SPECIFICATION forming part of Letters Patent No. 441,900, dated December 2, 1890.

Application filed scptember 19, 1890- Serial No. 365,4:77. (No model.)

To all whom it may concern.-

Be it known that I, JOSIAH Ross, a citizen of the United States, residing at Buffalo, in the county of Erie and State of New York, have invented new and useful Improvements in Drilling-Machines, of which the following is a specification.

This invention relates to a drilling-machine in which the drill-spindle is journaled in a feed-screw, whereby the drill is moved toward and from the bed-plate. In drills of this character as heretofore constructed the entire thrust of the drill was brought to bear against the lower side of the feed-screw, which caused this part to wear rapidly from theintense friction and necessitated the employment of heavy washers, which required to be he quently renewed.

The object. of my invention is to overcome this difficulty; and it consists to that end of a ball-bearing which is interposed between the drill-spindle and the feed-screw, thereby relieving these parts from excessive friction and wear, and enabling the drill to rotate with greater freedom and to be run. with less power.

In the accompanying drawings, liigure 1 is a fragmentary sectional elevation of a vertical drilling-machine provided with my improvements. Fig. 2 is a sectional elevation of the ball-bearing on an enlarged scale. Fig. 3 is a horizontal section in line a: 00, Fig. 2.

Like letters of reference refer to like parts in the several figures.

A represents the main frame of a vertical drilling-machine, and a the horizontal bedplate formed with or secured to the main frame.

B represents the bit or drill, which is secured in the socket b at the lower end of the vertical spindle O in the usual manner. The

lower portion of the drill-spindle is journaled in a hollow feed-screw D, which latter is arranged in a screw-threaded socket or opening (Z, formed at the outer end of an arm e of the main frame. The upper portion of the drillspindle is arranged to slide vertically through the hub of a bevel gear-wheel E, which latter is journaled in a bearing f, arranged in a projecting arm of the main frame. The bevelgear E is free to turn in its hearing, but is held against vertical movement by means of shoulders h 71., formed on its hub and abut-ting against opposite sides of the hearing. The

drill-spindle is compelled to rotate with the manner. A rotary motion is imparted to the.

drill-spindle by a bevel-gear G meshing with the gear-wheel of the spindle, but it may be operated in any other suitable manner.

J represents an annular shoulder formed on the spindle above the drill-socket, and is a ring or washer surrounding the spindle, resting on said shoulder and forming the lower part of the ball-bearing. The upper side of said ring is provided with an annular channel or groove is, in which an annular row of hardened steel balls of suitable diameter are arranged.

L represents another ring or washer surrounding the spindle, bearing upon the upper side of the balls and forming the upper part ofthe ball-bearing. The upper ring is provided in its lower side with an annular groove 1, in which the balls are seated. An annular depending flange Z is preferably formed on the upper ring, which flange overlaps the lower washer and excludes dust and dirt from the ball-bearin g. The lower end of the feed-screw bears against the upper washer, while the upper end of the feed-screw bears against a collar m, secured to the spindle, whereby the latter is compelled to move vertically with the feed-screw. Upon feeding the screw downwardly by means of the handwheel '12, when the drill rotates the drill is forced down upon its work through the medium of the ball-bearing, which latter permits a powerful pressure to be brought on the drill without excessively wearing the parts. It also reduces the friction considerably, permitting the drill to rotate more freely under the varying strains to which it is subjected and enablingit to be operated withless power.

This ball-bearing is very simple in construction, having but few parts, which can be easily renewed at moderate expense.

I claim as my invention 1. In a drillingunachine, the combination,

with the spindle and the feed device, of a an upper Washer resting on said balls and prol)allbearing interposed between said spindle vided with a marginal flange which overlaps and the feed device, substantially as set forth. the lower washer, and a feed-screw surround- 15 The co1nbination,witl1 thefeed-screw and ing the spindle and bearing upon the upper 5 the spindle journaled in the feed-screw and washer, substantially as set forth.

having a shoulder, of a ball-bearing inter- Witness my hand this 10th day of Septemposed between said feed-screw and the shoulder of the spindle, substantially as set forth. The combination, with the drill-spindle 10 having an annular shoulder, of a lower Witnesses:

grooved washer resting on said shoulder, an JNO. J. BONNER, annular row of balls arranged in said groove, FRED. C. GEYER.

ber,1890.

JOSIAH ROSS. 

